English
adamantean
From adamant + -ean.
Formed from adamant + -ean
Ancient Greek ἀδάμας ‘invincible’
Latin adamās ‘hard as steel’
Latin adamantem
Middle English adamant ‘adamant’
English adamant
Today it means
adj Of adamant; hard as adamant.
Language periods are conventional ranges, not dates for this word.
Etymograph / adamantean